Image scanning apparatus

Abstract

An image scanning apparatus includes an image capturing unit, a pulse driving unit and a control unit. The image capturing unit captures an image of an object. The pulse driving unit drives the image capturing unit and the object along a scanning direction to move with respect to each other among multiple pulse nodes, so as to scan the object. The control unit is electrically connected to the pulse driving unit and the image capturing unit, and the control unit controls the image capturing unit to capture multiple images of the object between adjacent pulse nodes, so as to synthesize a scanned image corresponding to the object.

What is claimed is: 
     
       1. An image scanning apparatus comprising:
 an image capturing unit; 
 a pulse driving unit; and 
 a control unit electrically connected to the pulse driving unit and the image capturing unit; wherein the image capturing unit captures an image of an object, the pulse driving unit drives the image capturing unit and the object along a scanning direction to move with respect to each other among multiple pulse nodes so as to scan the object, and the control unit controls the image capturing unit to capture multiple images of the object between adjacent pulse nodes of the multiple pulse nodes, so as to synthesize a scanned image corresponding to the object; wherein an image capturing number of the image capturing unit is digitally controlled to capture the multiple images by the control unit rather than by the pulse driving unit. 
 
     
     
       2. The image scanning apparatus according to  claim 1 , wherein the pulse driving unit is a stepper motor. 
     
     
       3. The image scanning apparatus according to  claim 1 , wherein a node distance between the adjacent pulse nodes is of a micron (um) level. 
     
     
       4. The image scanning apparatus according to  claim 1 , wherein a quotient of an image capturing number of the image capturing unit between the adjacent pulse nodes divided by a node distance between the adjacent pulse nodes is equal to a scanning resolution of the image scanning apparatus. 
     
     
       5. The image scanning apparatus according to  claim 1 , wherein a quotient of an image capturing number of the image capturing unit between the adjacent pulse nodes divided by a node distance between the adjacent pulse nodes is equal to or more than 4800 dpi. 
     
     
       6. The image scanning apparatus according to  claim 1 , wherein a quotient of an image capturing number of the image capturing unit between the adjacent pulse nodes divided by a node distance between the adjacent pulse nodes is equal to or more than 9600 dpi. 
     
     
       7. The image scanning apparatus according to  claim 1 , further comprising a scanning light source to provide a light to irradiate the object. 
     
     
       8. The image scanning apparatus according to  claim 7 , wherein the scanning light source and the image capturing unit are disposed at opposite sides of the object respectively. 
     
     
       9. The image scanning apparatus according to  claim 7 , wherein the scanning light source and the image capturing unit are disposed at the same side of the object respectively. 
     
     
       10. The image scanning apparatus according to  claim 1 , wherein the image capturing unit comprises a charge coupled device, a complementary metal oxide semiconductor sensor, or a contact image sensor. 
     
     
       11. The image scanning apparatus according to  claim 1 , wherein the image capturing unit comprises a Line-Scan light-sensing device or an Area-Scan light-sensing device. 
     
     
       12. The image scanning apparatus according to  claim 1 , further comprising a platform having a transparent material, wherein the object is disposed on the platform.